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积分运算和微分运算互为()

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将方波转换成三角波,可以使用()运算电路。

Choose the answer that correctly interprets the sentence from the text.Over time, my remaining hearing dropped to 20 percent, where it is today. (Para.1)

A. Gradually I lost more of my hearing until I was 80 percent deaf, as I currently remain.
B. Soon I lost 20 percent of my hearing after I moved to where I'm living today.

After doing that for a few weeks, I was hooked. (Para.2)

A. I was only interested in doing that for a few weeks.
B. I became really interested in doing that after a few weeks.

It was reassurance that they were giving me jobs because I was good, not out of sympathy. (Para.4)

A. I was good, so they had pity on me and gave me jobs. This is truly heart-warming.
B. Their attitude encouraged me as it showed they gave me jobs because they valued my skills, not because they felt sorry for me.

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